Class 8 Science – Chapter 2
Microorganisms: Friend and Foe
Worksheet – Practice Questions

---

Section A – Fill in the Blanks

1. Microorganisms that fix nitrogen in soil are called __________.
2. The process of heating milk to kill germs is called __________.
3. Yeast is used in the production of __________.
4. Cholera is caused by __________.
5. Vaccines help our body to develop __________ against diseases.

Section B – True or False

1. All microorganisms are harmful. ( )
2. Viruses can reproduce only inside a living cell. ( )
3. Antibiotics are effective against viral diseases. ( )
4. Microorganisms help in making curd. ( )
5. Food preservation prevents the growth of microorganisms. ( )

Section C – Very Short Answer

1. Name any one disease caused by bacteria.
2. Which microorganism is used in bread making?
3. What is vaccination?
4. Name one nitrogen-fixing bacterium.

Section D – Short Answer

1. Write two uses of microorganisms in our daily life.
2. Why should antibiotics not be taken without a doctor’s advice?
3. How do microorganisms spoil food?

Section E – Long Answer

1. Explain the role of microorganisms in agriculture.
2. Describe different methods of food preservation.

---

📝 Practice Regularly for Exam Success